1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/* Any assmbly language/system dependent hacks needed to setup boot1.c so it
* will work as expected and cope with whatever platform specific wierdness is
* needed for this architecture. */
/* Overrive the default _dl_boot function, and replace it with a bit of asm.
* Then call the real _dl_boot function, which is now named _dl_boot2. */
asm(
" .text\n"
" .globl _dl_boot\n"
" .type _dl_boot,@function\n"
"_dl_boot:\n"
" mr 3,1\n" /* Pass SP to _dl_boot2 in r3 */
" addi 1,1,-16\n" /* Make room on stack for _dl_boot2 to store LR */
" li 4,0\n"
" stw 4,0(1)\n" /* Clear Stack frame */
" bl _dl_boot2@local\n" /* Perform relocation */
" addi 1,1,16\n" /* Restore SP */
" mtctr 3\n" /* Load applications entry point */
" bctr\n" /* Jump to entry point */
" .size _dl_boot,.-_dl_boot\n"
" .previous\n"
);
#define DL_BOOT(X) static void* __attribute_used__ _dl_boot2(X)
/*
* Get a pointer to the argv array. On many platforms this can be just
* the address if the first argument, on other platforms we need to
* do something a little more subtle here.
*/
#define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long*) ARGS)+1)
/*
* Here is a macro to perform a relocation. This is only used when
* bootstrapping the dynamic loader. RELP is the relocation that we
* are performing, REL is the pointer to the address we are relocating.
* SYMBOL is the symbol involved in the relocation, and LOAD is the
* load address.
*/
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
{int type=ELF32_R_TYPE((RELP)->r_info); \
Elf32_Addr finaladdr=(SYMBOL)+(RELP)->r_addend;\
if (type==R_PPC_RELATIVE) { \
*REL=(Elf32_Word)(LOAD)+(RELP)->r_addend;\
} else if (type==R_PPC_ADDR32 || type==R_PPC_GLOB_DAT) {\
*REL=finaladdr; \
} else if (type==R_PPC_JMP_SLOT) { \
Elf32_Sword delta=finaladdr-(Elf32_Word)(REL);\
*REL=OPCODE_B(delta); \
PPC_DCBST(REL); PPC_SYNC; PPC_ICBI(REL);\
} else { \
_dl_exit(100+ELF32_R_TYPE((RELP)->r_info));\
} \
}
/*
* Transfer control to the user's application, once the dynamic loader
* is done. This routine has to exit the current function, then
* call the _dl_elf_main function.
*/
#define START() return _dl_elf_main
|
